Android Development Android Testing 2

Question 1

Which Espresso method is used to find a view by its resource ID?

Accepted Answer

onView(withId())

Answer

onView(withId(R.id.viewId)) finds the view with the specified resource ID in Espresso UI tests.

Question 2

What is Robolectric used for in Android testing?

Accepted Answer

Running Android instrumentation tests on the JVM without a device or emulator

Answer

Robolectric simulates the Android framework on the JVM, allowing instrumentation-style tests to run locally without needing a device.

Question 3

What does the @Before annotation do in JUnit?

Accepted Answer

Marks a method to run before each test method in the class

Answer

@Before marks a method that JUnit executes before each @Test method, commonly used for test setup like initializing objects.

Question 4

Which Espresso method simulates a button click in a UI test?

Accepted Answer

perform(click())

Answer

In Espresso, perform(click()) is chained after onView() to simulate a user tapping on the matched view.

Question 5

What is the TestCoroutineDispatcher used for in Android testing?

Accepted Answer

To control coroutine execution timing in tests for deterministic behavior

Answer

TestCoroutineDispatcher (or UnconfinedTestDispatcher) allows tests to control when coroutines run, enabling synchronous and deterministic coroutine testing.

Android Development Practice Test

Android Development Practice Test

Android Development Android Testing 2